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probably hardware problem so do the following:
switch off, unplug, open the case and make sure everything is properly connected - push the RAM and whatever cards you have so they fit nicely in their slots, check if cables are tightly connected too. Reboot, see if it helps, if not try the next step:
remove all the parts you don't need to boot your PC - CD ROMs, DVD ROMs, network card (you'll plug it later) etc, reboot and see if the computer works as it should, if it does then start addding components one by one until you see which one is gone bad
take a look at your CPU fan while the PC is working - see if it spins the way it should, buy air can and clean inside your PC just in case
if you have 2 memory chips it could be that the one's gone bad - remove the one, reboot and see if it works, do the same with the second RAM
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